package com.example.forum.services.impl;

import com.example.forum.common.AppResult;
import com.example.forum.common.ResultCode;
import com.example.forum.dao.ArticleMapper;
import com.example.forum.exception.ApplicationException;
import com.example.forum.model.Article;
import com.example.forum.model.Board;
import com.example.forum.model.User;
import com.example.forum.services.IArticleService;
import com.example.forum.services.IBoardService;
import com.example.forum.services.IUserService;
import com.example.forum.utils.StringUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;

/**
 * @Description: TODO
 * @Author Mr.Tang
 */
@Slf4j
@Service
public class ArticleServiceImpl implements IArticleService {

    @Resource
    private ArticleMapper articleMapper;

    // 需要对用户和版块操作
    @Resource
    private IUserService userService;

    @Resource
    private IBoardService boardService;


    @Override
    public void create(Article article) {
        // 非空校验
        if (article == null
                || article.getUserId() == null
                || article.getBoardId() == null
                || StringUtil.isEmpty(article.getTitle())
                || StringUtil.isEmpty(article.getContent())) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 设置默认值
        article.setVisitCount(0);
        article.setReplyCount(0);
        article.setLikeCount(0);
        article.setDeleteState((byte) 0);
        article.setState((byte) 0);
        Date date = new Date();
        article.setCreateTime(date);
        article.setUpdateTime(date);
        // 写入数据库
        int row = articleMapper.insertSelective(article);
        if (row != 1) {
            log.warn(ResultCode.FAILED_CREATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        // 更新用户发帖数
        User user = userService.selectById(article.getUserId());
        if (user == null) {
            log.warn("没有找到用户信息，发帖失败，user id = " + article.getUserId() );
            throw new ApplicationException(AppResult.failed("没有找到用户信息"));
        }
        userService.addOneArticleCountById(article.getUserId());
        // 更新版块帖子数量
        Board board = boardService.selectById(article.getBoardId());
        if (board == null) {
            log.warn("没有找到版块信息，发帖失败，board id = " + article.getBoardId() );
            throw new ApplicationException(AppResult.failed("没有找到版块信息"));
        }
        boardService.addOneArticleCountById(article.getBoardId());


        // 成功后打印日志
        log.info(ResultCode.SUCCESS.toString() + "，发帖成功。article id = " + article.getId());
    }

    @Override
    public List<Article> selectAll() {
        // 调用DAO
        List<Article> articles = articleMapper.selectAll();
        return articles;
    }

    @Override
    public List<Article> selectAllByBoardId(Long boardId) {
        if (boardId == null || boardId <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 校验版块是否存在
        Board board = boardService.selectById(boardId);
        if (board == null) {
            log.warn("board id = " + boardId +"，" +  ResultCode.FAILED_BOARD_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        // 调用DAO查询
        List<Article> articles = articleMapper.selectAllByBoardId(boardId);
        return articles;
    }

    @Override
    public Article selectDetailById(Long id) {

        if (id == null || id <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        // 调用DAO
        Article article = articleMapper.selectDetailById(id);
        // 判断非空
        if (article == null) {
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }

        // 更新帖子访问量
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setVisitCount(article.getVisitCount() + 1);
        // 保存到数据库
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }

        // 返回帖子详情
        article.setVisitCount(article.getVisitCount() + 1);  // 更新当前查到的访问数量，让页面正确显示
        return article;
    }

    @Override
    public Article selectById(Long id) {
        if (id == null || id <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        Article article = articleMapper.selectByPrimaryKey(id);
        return article;
    }

    @Override
    public void modify(Long id, String title, String content) {
        // 参数校验
        if (id == null || id <= 0 || StringUtil.isEmpty(title) || StringUtil.isEmpty(content)) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 构建一个新的帖子对象
        Article updateArticle = new Article();
        updateArticle.setId(id);
        updateArticle.setTitle(title);
        updateArticle.setContent(content);
        updateArticle.setUpdateTime(new Date());  // 更新时间
        // 更新
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }

    }

    @Override
    public void likeUpById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 获取帖子详情
        Article article = articleMapper.selectByPrimaryKey(id);
        if (article == null || article.getDeleteState() == 1) {
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        if (article.getState() == 1) {
            log.warn(ResultCode.Failed_ARTICLE_BANNED.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.Failed_ARTICLE_BANNED));
        }
        // 构造新的帖子对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setLikeCount(article.getLikeCount() + 1);
        updateArticle.setUpdateTime(new Date());
        // 调用DAO
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }

    }

    @Override
    public void deleteById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 根据id查询帖子信息
        Article article = articleMapper.selectByPrimaryKey(id);
        if (article == null || article.getDeleteState() == 1) {
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString() + ", article id = " + id);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        // 构造更新对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setDeleteState((byte) 1);
        updateArticle.setUpdateTime(new Date());
        // 调用DAO
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
        // 更新版块中的帖子数量
        boardService.subOneArticleCountById(article.getBoardId());
        userService.subOneArticleCountById(article.getUserId());

        log.info("删除帖子成功，article id = " + article.getId());
    }

    @Override
    public void addOneReplyCountById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 根据id查询帖子信息并校验
        Article article = articleMapper.selectByPrimaryKey(id);
        if (article == null || article.getDeleteState() == 1) {
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString() + ", article id = " + id);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        if (article.getState() == 1) {
            log.warn(ResultCode.Failed_ARTICLE_BANNED.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.Failed_ARTICLE_BANNED));
        }
        // 构造更新对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        // 回复数 +1
        updateArticle.setReplyCount(article.getReplyCount() + 1);
        updateArticle.setUpdateTime(new Date());
        // 调用DAO 执行更新
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }

    }

    @Override
    public List<Article> selectByUserId(Long userId) {
        // 非空校验
        if (userId == null || userId <= 0) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 查询用户是否存在
        User user = userService.selectById(userId);
        if (user == null) {
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString() + "，user id = " + userId);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        // 调用DAO
        List<Article> list = articleMapper.selectByUserId(userId);
        return list;
    }
}
